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Try this on for size:
Here's an exploded view.
http://www.brickshelf.com/gallery/ToaofTech/EV3LinearActuator/2015-03-29_11.18.53.jpg
This should be compact, robust, let you change gear ratios (so you can get more speed or more torque; the linear actuators are very slow for most applications.), and mount to your system quite well.
Cheers!